Tag: science & technology

Human beings have never set foot on Mars. While robotic missions like rovers and landers have successfully explored Mars, all human space missions to date have been limited to the Moon (Apollo missions) and low Earth orbit (International Space Station). No human has traveled beyond the Moon's orbit.

Spiders are arachnids, a class of arthropods that characteristically have 8 legs. This distinguishes them from insects, which have 6 legs. All spiders share this anatomical feature regardless of their species or size. The 4-leg and 6-leg options are incorrect for spiders.

A thermometer is a scientific instrument designed to measure temperature. It works on principles like thermal expansion of liquids (mercury or alcohol) or electrical resistance changes. Hygrometers measure humidity, barometers measure pressure, and rulers or tape measures measure length.

A light year is a unit of distance, specifically the distance that light travels in one year in vacuum (approximately 9.46 trillion kilometers or 5.88 trillion miles). It is commonly used to measure astronomical distances between stars and galaxies. It does not measure energy, speed, or intensity.

The Pacific Ocean is the largest and deepest ocean on Earth, covering approximately 63 million square miles. The Atlantic Ocean is the second-largest, covering about 41 million square miles. Therefore, the statement that the Atlantic is the biggest ocean is false.

A numismatist is a person who studies, collects, or invests in coins, paper currency, and related objects. The term comes from the Latin 'numisma' meaning coin. A philatelist collects stamps, which is a different hobby entirely.

A marathon is 26.2 miles (42.195 kilometers). This distance was standardized at the 1908 London Olympics, when the course was extended to finish under the royal nursery at Windsor Castle. To the nearest mile, this rounds to 26 miles.

Sharks are fish, not mammals. They have gills for breathing underwater, are cold-blooded, and most species lay eggs (though some give live birth). Mammals have lungs, are warm-blooded, and typically nurse their young with milk. Sharks belong to the class Chondrichthyes (cartilaginous fish).

The adult human skeleton typically contains 206 bones. This number decreases from approximately 270 bones at birth, as many bones fuse together during growth. Therefore, the statement that the skeleton has less than 100 bones is false.